Departing from normal meaning could be, e.g., a reference to a plurality of digital cameras in the specification that defines the term as including the singular (notwithstanding, it would be an up-hill battle for the patentee to argue against the plain English interpretation) - in nearly all cases the wording means at least 2.
– ThomasMHDec 18 '12 at 6:52

All the other stuff out there, which has been Officially introduced to the public in The U.S. Patent Office, "the plurality". In terms of patents "the plurality" meeting the standards by The U.S. Patent Office. However, in this event, "each of" qualified use of "the plurality". Therefore, all the stuff with more than one camera out there formally introduced to the public in this arena. Use of "the plurality", I take, here as meaning all previously known things practicing the art. Hence, meaning more than one.